The Head Custodian III Passbook(R) prepares you for your test by allowing you to take practice exams in the subjects you need to study. It provides hundreds of questions and answers in the areas that will likely be covered on your upcoming exam, including but not limited to: ability to read and follow written instructions; building cleaning; building operation and maintenance; operation and routine maintenance of heating, ventilating and air conditioning systems; keeping simple inventory records; and more.